import classNames from "classnames";
import Count from "../Count";
import "./index.scss";
import { useDispatch, useSelector } from "react-redux";
import {
  increCount,
  decreCount,
  clearCart,
} from "../../store/modules/takeaway";
import { useState } from "react";

const Cart = () => {
  const { cartList } = useSelector((state) => state.foods);

  // 计算总价
  const totalPrice = cartList.reduce((total, item) => {
    return total + item.count * item.price;
  }, 0);

  const dispatch = useDispatch();

  const [visible, setVisible] = useState(false);
  const onShow = () => {
    if (cartList.length === 0) {
      return;
    }
    setVisible(true);
  };

  return (
    <div className="cartContainer">
      {/* 遮罩层 添加visible类名可以显示出来 */}
      <div
        className={classNames("cartOverlay", visible && "visible")}
        onClick={() => setVisible(false)}
      />
      <div className="cart">
        {/* fill 添加fill类名可以切换购物车状态*/}
        {/* 购物车数量 */}
        <div
          className={classNames("icon", cartList.length > 0 && "fill")}
          onClick={onShow}
        >
          {cartList.length > 0 && (
            <div className="cartCornerMark">{cartList.length}</div>
          )}
        </div>
        {/* 购物车价格 */}
        <div className="main">
          <div className="price">
            <span className="payableAmount">
              <span className="payableAmountUnit">¥</span>
              {totalPrice.toFixed(2)}
            </span>
          </div>
          <span className="text">预估另需配送费 ¥5</span>
        </div>
        {/* 结算 or 起送 */}
        {cartList.length > 0 ? (
          <div className="goToPreview">去结算</div>
        ) : (
          <div className="minFee">¥20起送</div>
        )}
      </div>
      {/* 添加visible类名 div会显示出来 */}
      <div className={classNames("cartPanel", visible && "visible")}>
        <div className="header">
          <span className="text">购物车</span>
          <span
            className="clearCart"
            onClick={() => dispatch(clearCart(), setVisible(false))}
          >
            清空购物车
          </span>
        </div>

        {/* 购物车列表 */}
        <div className="scrollArea">
          {cartList.map((item) => {
            return (
              <div className="cartItem" key={item.id}>
                <img className="shopPic" src={item.picture} alt="" />
                <div className="main">
                  <div className="skuInfo">
                    <div className="name">{item.name}</div>
                  </div>
                  <div className="payableAmount">
                    <span className="yuan">¥</span>
                    <span className="price">{item.price}</span>
                  </div>
                </div>
                <div className="skuBtnWrapper btnGroup">
                  {/* 数量组件 */}
                  <Count
                    count={item.count}
                    onPlus={() => {
                      dispatch(increCount({ id: item.id }));
                    }}
                    onMinus={() => {
                      dispatch(decreCount({ id: item.id }));
                    }}
                  />
                </div>
              </div>
            );
          })}
        </div>
      </div>
    </div>
  );
};

export default Cart;
